Setting up a new african tank.
Lots of Holey rock, stacked back wall sloping toward mid front.
Need advice on water circulation.
I'm using two 440 HOB emperor filters.
Hydor Pumps have a good reputation so;
1- How many pumps do I need
2-Which pumps (see below)
3- Where should I place them in the tank.

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I don't think there's really a wrong answer to this. If it were me, I'd be going with one of the midrange units. Probably come down to price. Those gph ratings look high, but it's deceiving because it's a different type of dispersal than a power head. The small one may seem to you like it's not pushing that much. I'd look at price and choose between the middle two.

Position? I'd go back corners. Get them to work in conjunction with your filters. I point mine up because me sump returns point down. If you're getting a lot of surface ripple from your HOB returns, then I'd tend to want to point yours down. Angle them a bit toward the front face and down. Go for a rolling, gentle current. Add some light flake food or pellet and watch. Make any changes as needed. The goal when I work this out is to have a gentle current throughout, no dead spots, and some surface ripple. Accomplish that and it works.

2 750's indeed. i got a pair at petmountain rather cheaply just the other day for my 125 mbuna setup. tons of rock just like urs and it has done wonders with water clarity. i can literally see tons of waste and otherwise nasty particles get circled throughout the tank before getting sucked up by the filters. GL to ya, they should work well.

So;
1- one at the top of back wall left corner pointing toward middle front bottom, the other left bottom side wall a bit above substrate level just pointing right. The should get a good counter clockwise current going.
OR, am I way over thinking this?

Smitty- "I would probably go with one of the more higher rated ones." Do you mean higher rated like Hydor? "Consider electrical use of 1 compared to 2." What do you mean by this.

Just put in substrate this am & re-scaped it. After the cloud clears, if I like the Scaping I'll add some ammonia & start the cycle. YAY.

i just point my two pumps down toward the center of the tank, about 5 inches from the waters surface on both ends of the tank. seems to work out, the back of my tank is the still zone in my tank so it helps keep the whole thing circulated. i would point yours wherever your dead zones are (waste will collect there most of the time) to figure out where u want more current.